A9782A & A9784A PCI-X 2 Gigabit Fibre Channel and Gigabit Ethernet Combination Card Installation Guide

HP-UX Installation
Optional Step: Configure Jumbo Frames Size
Chapter 1
12
Optional Step: Configure Jumbo Frames Size
NOTE (Jumbo frames are supported only at 1000 Mbit/s
• Jumbo frames for the igelan driver on HP-UX 11i v1 or 11i v2 have an mtu_size of 9000 bytes.
If you are using Jumbo Ethernet frames, ensure that all end stations on a given LAN* have the same
maximum transmission unit (MTU) setting. However, switch ports in your LAN can have any MTU
setting greater than or equal to the end station’s MTU. (*Note: here “LAN” means that the end stations do
not have any routers in between them.)
• Obtain the PPA number of the card by entering lanscan.
• Choose one of two configuration methods that will permanently save your configuration.
— use the GUI-based system admin manager (SAM).
To use SAM, type sam at the HP-UX system prompt; then double-click Networking and
Communications, and then Advanced Configuration--see Ethernet Support Guide for details, and then
do the steps for verifying the MTU size; or
edit the following configuration file using an editor such as “vi”:
/etc/rc.config.d/hpigelanconf.
Set the mtusize by editing HP_IGELAN_MTU[0]= mtusize , and insert the proper interface name:
HP_IGELAN_INTERFACE_NAME. When the system reboots, the interface will be configured for
jumbo frame operation.
• Verify MTU change by entering netstat -rn. If MTU has not changed, enter the following commands:
$ifconfig lan PPA_number unplumb
$ifconfig lan PPA_number ip_address netmask netmask up
• To check (or verify) the current Ethernet frame size, enter:
$lanadmin -m PPA_number
An alternative way to temporarily** configure jumbo frame size is to enter:
lanadmin -M mtu_size PPA_number .
The PPA_number is the one we obtained from the output of lanscan. For Jumbo Frames using the igelan
Gigabit Ethernet driver on HP-UX 11i v1, set the mtu_size to 9000 (bytes). For using Jumbo Frames with the
igelan driver on 11i v2 of September 2004 (or later), set the mtu_size to a number in the range of 1501 to
9000 bytes.
**Note: using lanadmin will not preserve your settings across reboots.